The best replacement for micturition is voiding.

The best alternatives to micturition are rated as following:
★★★★★  voiding
★★  micturition
★★  urination

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Speaking about micturition, one probably shouldn't forget about urgency.

Other search terms related to micturition and their ratings are:
★★★★★ urgency
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Google Trends

Scale is based on the average worldwide traffic of micturition in all years. Click on graph for more.
micturition
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